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* Re: c++/4999: asm code with concatenated content fails in template class member functions
@ 2001-12-03 16:54 rodrigc
0 siblings, 0 replies; 6+ messages in thread
From: rodrigc @ 2001-12-03 16:54 UTC (permalink / raw)
To: gcc-bugs, gcc-gnats, gcc-prs, nobody, sethml
Synopsis: asm code with concatenated content fails in template class member functions
State-Changed-From-To: open->feedback
State-Changed-By: rodrigc
State-Changed-When: Mon Dec 3 16:54:57 2001
State-Changed-Why:
I don't think you have valid asm. Here is what gcc 3.0.3 (prerelease)
says when I try to compile your code:
bug1.cc: In static member function `static int test<X>::foo(int*, int*) [with X
= int]':
bug1.cc:21: instantiated from here
bug1.cc:4: invalid `asm': operand number missing after %-letter
bug1.cc:4: invalid `asm': operand number missing after %-letter
bug1.cc:5: invalid `asm': operand number missing after %-letter
bug1.cc:5: invalid `asm': operand number missing after %-letter
bug1.cc:6: invalid `asm': operand number missing after %-letter
bug1.cc:6: invalid `asm': operand number missing after %-letter
bug1.cc:8: invalid `asm': operand number missing after %-letter
bug1.cc:8: invalid `asm': operand number missing after %-letter
bug1.cc:9: invalid `asm': operand number missing after %-letter
bug1.cc:9: invalid `asm': operand number missing after %-letter
bug1.cc:10: invalid `asm': operand number missing after %-letter
bug1.cc:10: invalid `asm': operand number missing after %-letter
bug1.cc:11: invalid `asm': operand number missing after %-letter
bug1.cc:11: invalid `asm': operand number missing after %-letter
bug1.cc:12: invalid `asm': operand number missing after %-letter
bug1.cc:12: invalid `asm': operand number missing after %-letter
bug1.cc:13: invalid `asm': operand number missing after %-letter
bug1.cc:13: invalid `asm': operand number missing after %-letter
bug1.cc:14: invalid `asm': operand number missing after %-letter
bug1.cc:14: invalid `asm': operand number missing after %-letter
bug1.cc:15: invalid `asm': operand number missing after %-letter
bug1.cc:15: invalid `asm': operand number missing after %-letter
bug1.cc:16: invalid `asm': operand number missing after %-letter
bug1.cc:16: invalid `asm': operand number missing after %-letter
You might want to contact the libmmx maintainer about this.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=4999&database=gcc
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: c++/4999: asm code with concatenated content fails in template class member functions
@ 2001-12-04 0:06 rodrigc
0 siblings, 0 replies; 6+ messages in thread
From: rodrigc @ 2001-12-04 0:06 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/4999; it has been noted by GNATS.
From: rodrigc@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org, gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org,
nobody@gcc.gnu.org, sethml@ofb.net
Cc:
Subject: Re: c++/4999: asm code with concatenated content fails in template class member functions
Date: 4 Dec 2001 08:02:49 -0000
Synopsis: asm code with concatenated content fails in template class member functions
State-Changed-From-To: feedback->closed
State-Changed-By: rodrigc
State-Changed-When: Tue Dec 4 00:02:49 2001
State-Changed-Why:
gcc 2.95.3 was the latest FSF stable release of the gcc 2.95 tree. It cannot compile the MMX code you provided in your latest testcase without FSF unsupported patches to the compiler.
gcc 2.95.4 is not an FSF release, but is a release from
Debian. I do not know if this release has MMX patches in
gcc 2.95 is currently a maintenance release, and most
active FSF gcc development and bugfixing is going on
in the gcc 3.x series.
gcc 3.0, which has MMX support integrated, can successfully
compile your testcase.
it or not.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=4999&database=gcc
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: c++/4999: asm code with concatenated content fails in template class member functions
@ 2001-12-04 0:02 rodrigc
0 siblings, 0 replies; 6+ messages in thread
From: rodrigc @ 2001-12-04 0:02 UTC (permalink / raw)
To: gcc-bugs, gcc-gnats, gcc-prs, nobody, sethml
Synopsis: asm code with concatenated content fails in template class member functions
State-Changed-From-To: feedback->closed
State-Changed-By: rodrigc
State-Changed-When: Tue Dec 4 00:02:49 2001
State-Changed-Why:
gcc 2.95.3 was the latest FSF stable release of the gcc 2.95 tree. It cannot compile the MMX code you provided in your latest testcase without FSF unsupported patches to the compiler.
gcc 2.95.4 is not an FSF release, but is a release from
Debian. I do not know if this release has MMX patches in
gcc 2.95 is currently a maintenance release, and most
active FSF gcc development and bugfixing is going on
in the gcc 3.x series.
gcc 3.0, which has MMX support integrated, can successfully
compile your testcase.
it or not.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=4999&database=gcc
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: c++/4999: asm code with concatenated content fails in template class member functions
@ 2001-12-03 21:36 sethml
0 siblings, 0 replies; 6+ messages in thread
From: sethml @ 2001-12-03 21:36 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/4999; it has been noted by GNATS.
From: sethml@ofb.net
To: rodrigc@gcc.gnu.org
Cc: gcc-bugs@gcc.gnu.org, gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org,
nobody@gcc.gnu.org, sethml@ofb.net
Subject: Re: c++/4999: asm code with concatenated content fails in template class member functions
Date: Mon, 03 Dec 2001 21:29:17 -0800
> I don't think you have valid asm. Here is what gcc 3.0.3 (prerelease)
> says when I try to compile your code:
Uh, I filed the bug report against 2.95.4, not 3.0. It looks like
gcc-3.0 became more strict about stray '%'s in code. If I fix the
'%'s, the problem remains. Note that it is only a problem with 2.95 -
apparently it's been fixed in 3.0. I'm making the assumption that
2.95 is still being actively maintained.
Here's a version that compiles under gcc-3.0, but breaks gcc-2.95.4:
template <class X> struct test {
static int foo(int *b1, int *b2) {
__asm__ ("movq" " %0, %%" "mm2" : : "m" (*(long long *)b1));
__asm__ ("movq" " %%" "mm2" ", %%" "mm3") ;
__asm__ ("punpckhbw" " %%" "mm0" ", %%" "mm2") ;
__asm__ ("punpckhbw" " %%" "mm0" ", %%" "mm3") ;
__asm__ ("movq" " %0, %%" "mm4" : : "m" (*(long long *)b2));
__asm__ ("movq" " %%" "mm4" ", %%" "mm5") ;
__asm__ ("punpckhbw" " %%" "mm0" ", %%" "mm4") ;
__asm__ ("punpckhbw" " %%" "mm0" ", %%" "mm5") ;
__asm__ ("psubsw" " %%" "mm4" ", %%" "mm2") ;
__asm__ ("psubsw" " %%" "mm5" ", %%" "mm3") ;
__asm__ ("pmaddwd" " %%" "mm2" ", %%" "mm2") ;
__asm__ ("pmaddwd" " %%" "mm3" ", %%" "mm3") ;
__asm__ ("paddd" " %%" "mm2" ", %%" "mm1") ;
__asm__ ("paddd" " %%" "mm3" ", %%" "mm1") ;
}
};
int main(int argc) {
test<int>::foo(&argc, &argc);
}
Seth
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: c++/4999: asm code with concatenated content fails in template class member functions
@ 2001-12-03 16:56 rodrigc
0 siblings, 0 replies; 6+ messages in thread
From: rodrigc @ 2001-12-03 16:56 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/4999; it has been noted by GNATS.
From: rodrigc@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org, gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org,
nobody@gcc.gnu.org, sethml@ofb.net
Cc:
Subject: Re: c++/4999: asm code with concatenated content fails in template class member functions
Date: 4 Dec 2001 00:54:57 -0000
Synopsis: asm code with concatenated content fails in template class member functions
State-Changed-From-To: open->feedback
State-Changed-By: rodrigc
State-Changed-When: Mon Dec 3 16:54:57 2001
State-Changed-Why:
I don't think you have valid asm. Here is what gcc 3.0.3 (prerelease)
says when I try to compile your code:
bug1.cc: In static member function `static int test<X>::foo(int*, int*) [with X
= int]':
bug1.cc:21: instantiated from here
bug1.cc:4: invalid `asm': operand number missing after %-letter
bug1.cc:4: invalid `asm': operand number missing after %-letter
bug1.cc:5: invalid `asm': operand number missing after %-letter
bug1.cc:5: invalid `asm': operand number missing after %-letter
bug1.cc:6: invalid `asm': operand number missing after %-letter
bug1.cc:6: invalid `asm': operand number missing after %-letter
bug1.cc:8: invalid `asm': operand number missing after %-letter
bug1.cc:8: invalid `asm': operand number missing after %-letter
bug1.cc:9: invalid `asm': operand number missing after %-letter
bug1.cc:9: invalid `asm': operand number missing after %-letter
bug1.cc:10: invalid `asm': operand number missing after %-letter
bug1.cc:10: invalid `asm': operand number missing after %-letter
bug1.cc:11: invalid `asm': operand number missing after %-letter
bug1.cc:11: invalid `asm': operand number missing after %-letter
bug1.cc:12: invalid `asm': operand number missing after %-letter
bug1.cc:12: invalid `asm': operand number missing after %-letter
bug1.cc:13: invalid `asm': operand number missing after %-letter
bug1.cc:13: invalid `asm': operand number missing after %-letter
bug1.cc:14: invalid `asm': operand number missing after %-letter
bug1.cc:14: invalid `asm': operand number missing after %-letter
bug1.cc:15: invalid `asm': operand number missing after %-letter
bug1.cc:15: invalid `asm': operand number missing after %-letter
bug1.cc:16: invalid `asm': operand number missing after %-letter
bug1.cc:16: invalid `asm': operand number missing after %-letter
You might want to contact the libmmx maintainer about this.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=4999&database=gcc
^ permalink raw reply [flat|nested] 6+ messages in thread
* c++/4999: asm code with concatenated content fails in template class member functions
@ 2001-12-03 16:16 sethml
0 siblings, 0 replies; 6+ messages in thread
From: sethml @ 2001-12-03 16:16 UTC (permalink / raw)
To: gcc-gnats
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 5753 bytes --]
>Number: 4999
>Category: c++
>Synopsis: asm code with concatenated content fails in template class member functions
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: rejects-legal
>Submitter-Id: net
>Arrival-Date: Mon Dec 03 16:16:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: sethml@ofb.net
>Release: 2.95.4
>Organization:
>Environment:
Debian unstable (sid) i386, Linux 2.2.17
>Description:
It appears that using literal string concatenation within asm code can cause corruption of the assembly generated by gcc - it contains random junk (including characters with the high bit set) rather than the assembly, and gas gives up. Note that literal string concatenation within asm code is used extensively by libmmx:
http://min.ecn.purdue.edu/~rfisher/Research/Libmmx/libmmx.html
Here's a chunk of code that demonstrates the problem:
template <class X> struct test {
static int foo(int *b1, int *b2) {
__asm__ ("movq" " %0, %%" "mm2" : : "m" (*(long long *)b1));
__asm__ ("movq" " %" "mm2" ", %" "mm3") ;
__asm__ ("punpckhbw" " %" "mm0" ", %" "mm2") ;
__asm__ ("punpckhbw" " %" "mm0" ", %" "mm3") ;
__asm__ ("movq" " %0, %%" "mm4" : : "m" (*(long long *)b2));
__asm__ ("movq" " %" "mm4" ", %" "mm5") ;
__asm__ ("punpckhbw" " %" "mm0" ", %" "mm4") ;
__asm__ ("punpckhbw" " %" "mm0" ", %" "mm5") ;
__asm__ ("psubsw" " %" "mm4" ", %" "mm2") ;
__asm__ ("psubsw" " %" "mm5" ", %" "mm3") ;
__asm__ ("pmaddwd" " %" "mm2" ", %" "mm2") ;
__asm__ ("pmaddwd" " %" "mm3" ", %" "mm3") ;
__asm__ ("paddd" " %" "mm2" ", %" "mm1") ;
__asm__ ("paddd" " %" "mm3" ", %" "mm1") ;
}
};
int main(int argc) {
test<int>::foo(&argc, &argc);
}
Here's what happens when attempting to compile it, for me:
% g++ -v --save-temps bug1.cc
Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.4/specs
gcc version 2.95.4 20011006 (Debian prerelease)
/usr/lib/gcc-lib/i386-linux/2.95.4/cpp0 -lang-c++ -v -D__GNUC__=2 -D__GNUG__=2 -D__GNUC_MINOR__=95 -D__cplusplus -D__ELF__ -Dunix -D__i386__ -Dlinux -D__ELF__ -D__unix__ -D__i386__ -D__linux__ -D__unix -D__linux -Asystem(posix) -D__EXCEPTIONS -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ bug1.cc bug1.ii
GNU CPP version 2.95.4 20011006 (Debian prerelease) (i386 Linux/ELF)
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3
/usr/local/include
/usr/lib/gcc-lib/i386-linux/2.95.4/include
/usr/include
End of search list.
The following default directories have been omitted from the search path:
/usr/lib/gcc-lib/i386-linux/2.95.4/../../../../i386-linux/include
End of omitted list.
/usr/lib/gcc-lib/i386-linux/2.95.4/cc1plus bug1.ii -quiet -dumpbase bug1.cc -version -o bug1.s
GNU C++ version 2.95.4 20011006 (Debian prerelease) (i386-linux) compiled by GNU C version 2.95.4 20011006 (Debian prerelease).
as -V -Qy -o bug1.o bug1.s
GNU assembler version 2.11.92.0.10 (i386-linux) using BFD version 2.11.92.0.10 20011021 Debian/GNU Linux
bug1.s: Assembler messages:
bug1.s:46: Error: invalid character (0xffffffe7) in mnemonic
bug1.s:47: Error: invalid character (0xffffffa0) in mnemonic
bug1.s:48: Warning: rest of line ignored; first ignored character valued 0xb
bug1.s:49: Warning: rest of line ignored; first ignored character is `6'
bug1.s:50: Error: invalid character '.' in mnemonic
bug1.s:57: Error: invalid character '>' in mnemonic
I've attached an archive with the intermediate .s file, which contains such exciting lines of assembly as "pç8ç&", "e.t.foo__t4test1ZiPiT1", and "int>::foo(int *, int *)". Clearly there's some random memory corruption going on.
See also bug report titled "volatile asm code fails in template class member functions".
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2001-12-04 8:06 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2001-12-03 16:54 c++/4999: asm code with concatenated content fails in template class member functions rodrigc
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2001-12-04 0:06 rodrigc
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2001-12-03 16:56 rodrigc
2001-12-03 16:16 sethml
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